| Rupertia J.W. Grimes, 1990 |
| Rupertia rigida (Parish) J.W. Grimes, 1990 |
| Russellodendron Britton & Rose, 1930 |
| Russellodendron cacalaco (Bonpl.) Britton & Rose, 1930 |
| Sagitticarpi A.E. Estrada, Villarreal & Encina, 2020 |
| Samanea (Benth.) Merr., 1916 |
| Samanea leucocalyx Britton & Rose,1928 |
| Samanea saman (Jacq.) Merr., 1916 |
| Samanea schaffneri (S. Watson) J.F. Macbr., 1919 |
| Schizolobium Vogel, 1837 |
| Schizolobium covilleanum Pittier, 1917 |
| Schizolobium excelsum Vogel, 1837 |
| Schizolobium glutinosum Tul., 1846 |
| Schizolobium kellermanii Pittier, 1917 |
| Schizolobium parahyba (Vell.) S.F. Blake, 1919 |
| Schnella Raddi, 1820 |
| Schnella glabra (Jacq.) Dugand, 1941 |
| Schnella guianensis (Aubl.) Wunderlin, 2010 |
| Schnella herrerae Britton & Rose, 1930 |
| Schnella microstachya Raddi, 1820 |